∵x2-1x-1的值为0，
故x2-1=0且x-1≠0，
解得x=-1，
故选B．
To save class time，our teacher has ________ students do half of the exercise in class and complete the other half for our homework.
A．us
B．we
C．our
D．ours
公司员工应严格执行安全生产的规章制度，遵守安全操作规程，正确使用防护用品，及时发现和消除事故隐患。
